Machine for forming rounded corners upon rectangular material



1 646 986 0612. 25, 1927. A. VIDOR 9 MACHINE FOR FORMING ROUNDE D CORNERS UPON RECTANGULAR MATERIAL Filed 001:. 23, 1926 ATTORNEYS Patented Get. 25, 1927.

warren stares intense PATENT OFFICE.

ARMIN VIIDOR, F BUDAPEST, HUNGARY.

MACHINE FOR FORMING ROUN'DED CORNERS UPON RECTANGULAR MATERIAL.

Application filed October 23, 1926. Serial No. 143,779.

for forming round-cornered boxes or covers.

It has the advantage that the dies to be used for the different operations can be exactly adjusted and readily fixed inposition, and particularly the drawing over of round corners can be readily and precisely carried out.

The various features of the invention which are more specifically pointed out in the appended claims will be readily understood from the following description with reference to the accompanying drawing, wherein:

Figure 1 is a horizontal section through,

the machine, Fig. 2 is a section on line CD of Fig. 1, Fig. 3 is a plan showing a portion of a machine with a table having angle forming means, Fig. at is a side view partly in section of a machine for stamping round corners, Fig. 5 is a horizontal section through the machine as used for punching holes, Fig. 6 shows a detail, hereinafter described, and Fig. 7 is a perspective view of the tool or stamp hereinafter described.

The work table of the machine is constituted by a fiat plate 1, which is completely open at the front and both sides, while for guiding the plunger 2'which carries the various tools and for supporting the pivotal arm 3 which effects up and down movement of said plunger, a forwardly projecting standard 1 is arranged on the rear of said plate.

The side walls of the usual circular opening or well 5 .in the work table, which is arranged beneath the plunger 2, is provided with a screw thread in which a ring 6 for taking the various matrices or dies is F O screwed. The upper edge of the ring 6 is provided with slots 7 for the insertion of a key for turning the ring, while at the side is formed a bore 8. The latter ,is threaded, and a set screw 9 for fixing the ring passes therethrough, said screw also passing through an inset piece 10 recessed in the work table and serving as a nut. In the ring 6 are inserted the necessary matrices for the book-binding process, perforating, stamping, or other operation to be performed, such matrix also being provided with a recess or bore into which the end of screw 9 enters and secures the matrix in the ring 6.

On the work table 1 are also provided several bores and tapped holes for securing bolts for the various guides, base plates and so on.

A screw 11 passes through the standard 4 and terminates in a smooth spindle 12 serving to-hold an angle-drawing die against movement.

Angle dies hitherto used for rounding corners do not work with sufficient accuracy.

The work must be adjusted at an angle to the work table, which position is indicated by spring 15, Fig. 4 which constitutes the work support. Moreover the corner to be drawn over must be adjusted to overlie the crown of the angle. Finally, before the tool descends the adjusted edge must be pressed down or trimmed. In order to facilitate this work, the spring 15 (Figs. 3 and 4) inclined upwardly, is secured upon the base plate 13 of the angle die 14, this spring constituting the surface on which the work piece such as a book back, for example, is placed. The angle die proper, 14:, is secured by thumb nuts is upon its base plate. This renders it possible to readily remove the angle die from the base plate and substitute another die of different size for difierent work. The upper tool is constructed in the following manner. The shaft 16 of a threecornered die or stamp 17, Fig. 4, is provided with a bore in which is arranged a vertically slidable spindle 18, the lower end of the spindle being formedwith a head 19. In the bore of the plunger is a spring 20, which presses on the spindle 18. When the plunger 2 is moved forcibly downward under the influence of operating arm or handle 3, the head 19 first contacts with the work. While the device is adapted to operate upon cards of single thickness, it is usually employed in conjunction with work in which an outer covering sheet or binding is pasted on a cardboard or other back. Consequently, at this time, the material is moist and flexible, having been rendered so by the presence of the paste. When the work is placed in position upon the work supporting spring 15 and with its edges snugly against the straight surfaces of the angle die, the sharp right angular corner of the work overlies the upper face of the angle die 14. This is due to V-grooves 21 (Figs. 2, 4 and 6).

the factthat the inner concave face of the angle die presents a rounded face at the apex of said die, and since the work has a square corner, before being operated upon, it follows that said projecting corner must overlie the crown of the angle die so that when the head 19 contacts with the work, continued downward movement of the plunger 2 and said head forces the work downwardly into the forming die which results in bending the sharp corner of the work upwardly. Movement of the work downwardly under pressure of head 19 continues until the work rests flat upon the plate 13 of the angle .di.e. Further downward movement of the plunger causes the three cornered tool or stamp 17 to be thrust forcibly down upon theupturned corner and folds said corner over and crowds it down upon the main body. The three cornered die fits snugly in the angle die. The result is to make a very neatly roundedcorner on the work. At the same time the grooves 17 crimp the turned over corner in close simulationof hand .On-the lower surface of the three-cornered stamp, adjacentits rounded crown, are arranged radiatinggrooves, which reproduce the creases which occur in drawing round corners by hand. r

In order to prevent movement of the angle die towards the standard 4, the screw 11 is turnedjuntil its spindle 12 liesagainst the apex 'of the angle die and serves as a back stop therefor.

The side edges of plate 1 are formed with In consequence of these guides, aplate 22 can be slidably mounted on the work table 1, while in the plunger 2 is secured a hot plate 23, so that the machine can be used as a goldleaf I press.

Insteadof the base plate 22 and hot plate 23. plates for colour printing may be similarly mounted in the machine, which may then be used as a colour printing press. In both cases the paper to be treated can be of any desired length, since the sides ofthe machine are completely open.

'I claim 7 j .1. A machine for forming rounded corners upon sheets of rectangular material, comprising an angle. die,consistin of straight working surfaces to receive theedges of the work and a rounded surface connecting said straight surfaces, a plunger and a tool carried by said plunger and conforming in shape to and traversed across theface of the angle die under the movement of said plunger and a member cooperating with said plunger and engaging the wo-rkin ad vance of the tool to force said work downwardly into the angle die and initially turn the corner of the work prior to the engagement of the tool therewith.

connecting said straight surfaces, :15 plunger and a tool carriedby said plunger and conformlng in shape to and traverse across the face of the angle die under the move ment of said plunger, and. a head carried by said tool and yieldably mounted with respect thereto close enough to the apex of the tool to initially engage said work and force it downwardly into the angle die to turn the corner of the workprior to engagement of the tool with said work. l

3. A machine for forming rounded corners upon sheets of rectangular material, comprising an angle die, consisting of straight working surfaces to receive the edges .of' the work and a roundedsurface connecting said "straight surfaces, a plunger and a tool carried by said plunger and conforming in shape to and traversed .acrossthe face of thea-ngle die underthe movement of said plunger, a spring-pressed spindle slidable in said tool and ahead carried by said spindle and projected by said spring beyond the face of the tool, said head being 'located so .close to the .apeX of the tool that upon the initial movementof the plunger said head will act to initially force the work downwardly into the angle .die and bend the corner thereof and will then yield to permit continued downward movement of the tool to foldand compress the corner of the Work.

4:. A structure as recited in claim 1 in combination with a worksupporting elementdisposed at such an angle withrespect to the angle die that a sheet of rectangular material disposed thereon with its edges against the straight surfaces of the angle die will have its corner projected over the crown of the angle die. I

5. A structure as recited in claim 2 in combination with a member thrusting forcibly against the rear of the angle die.

6.-A structure as recited in: claim 2 in combination with an adjusting screw acting againstthe rear face of the angle die.

7. A structure as recited in claim3 wherein said tool is provided with radiating grooves upon that portion of itsiworking surface which contacts with said corner to thereby impress said corner in simulation of hand work. I V v 8. A machine for forming rounded corners upon sheets. ofmaterial comprising a vertically reciprocatory plunger, ,an. upper tool in said plunger comprising a triangular body and a yieldablehead projecting below the lower face of said body, and ,a lower toolconsisting of. an angle-forming die-having straight working surfaces disposed at right angles to each other connected by a die, the rectangular corner of said sheet Will 10 project over the upper surface of the die, the yield-able head lying close enough to the apex of the die to initially engage the Work and force it downwardly into the angle die to turn the corner of the work, prior to en- 15 gagement of the tool with said Work.

ARMIN VIDOR. 

